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Ricci

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Everything posted by Ricci

  1. Ricci

    Ricci's Skhorn Subwoofer & Files

    My advice would be to pay the operator to setup a cut program off of the print. It's not hard. He should no how to do that. Barring that perhaps someone will help you out.
  2. Ricci

    Samps DS21 Build

    I'd do xmech rating +2mm or something. You'd never ever hit that but you don't want to take that chance either.
  3. Ricci

    Samps DS21 Build

    Wobbles could be reflections from surfaces and vibration/resonances. I put about 150lbs on my speaker stand to drop the vibration resonance of the top section down below 5Hz. Otherwise it shows up in the impedance measurements. You'd be surprised what adding some weight and turning the cab just 15 degrees might do sometimes. I bet that desk isn't as stable as you'd think. I usually put my cabs on a bar stool if measuring in my garage and angle them towards the far corner then add a couple 50lb dumb bells and some sandbags on top. Larger cabs like Skhorns, MAULS, etc. get done outdoors.
  4. Ricci

    Samps DS21 Build

    Not having the driver bolted in will probably make the system a bit lossy too. I'd expect that standing the cab up and properly bolting in the driver and sealing it will probably sharpen the lower peak a little and perhaps lower it a bit more.
  5. Ricci

    Ricci's Skhorn Subwoofer & Files

    Im not real sure. Never tried it. Id guess at 3 or 4 inches minimum if driving it hard. If you try let us know how it works out.
  6. Ricci

    Samps DS21 Build

    Cheers Mike for helping Samps out.
  7. Pretty much what Mike said...We don't have official forum policy. There are a couple of us that are "mods", of which I'm one, but at this point it is mostly about having the rights needed just in case. Mostly for banning spammers that get through the gates occasionally. Small team and member pool here. There is no on-duty forum sheriff, 24/7 policing around here. Ain't nobody got time for that and really it's not needed. If someone acts like a true scumbag ass-hat they'll get the boot but that's never happened to this point. If this forum ever got really big and developed a problem with lots of post moderation needed I'd probably lean towards going to using real names for users. (I always have on audio forums anyway) That seems to prevent a lot of BS in the first place without having to employ a bunch of internet police.
  8. Ricci

    Samps DS21 Build

    Looks good. Yes I would expect your port to act a bit longer than what you have calculated for the length plus 90deg turn since it is close to the back wall. I'd guess it acts a good 3" longer than expected. Impedance measurement should show where it lands.
  9. Ricci

    Inductance modelling

    I've been talking with Bolserst through email. He's the guy doing a lot of the leg work on this with David McBean (HornResponse creator) over at DIYAudio forum. I've sent him some measurement files that he is going to look at. This is another one of those community projects that might turn out to benefit a whole lot of people.
  10. Interesting comparison of the declipper function Shred. Could you hear a difference? I know it might be difficult on some very short transient peaks but just wondering.
  11. Ricci

    Inductance modelling

    I have all of that it's just picking a format to report it in. LIMP offers several. Also the website isn't setup to accept it. I'd have to put it in the notes or on the forums.
  12. Ricci

    Inductance modelling

    Will WT2 export text? That may be enough to import into REW and let it calculate.
  13. Ricci

    Ricci's Skhorn Subwoofer & Files

    If you use something like the PZB100 drivers you will probably lose around 10-12dB in maximum output when compared to the version I have with the 21Ipal's.
  14. Ricci

    Othorn - HT capable?

    Vented boxes can have problems that have resulted in a common preconception of what ported sounds like. Typically this is formed by years of listening to commercial, or mass market vented subs that are undersized, underported, using a cheap driver, badly built or braced, tuned way too high, bad integration into the room acoustics, or some combination of all of it. A "good" vented design can sound excellent. I tend to prefer modern, high power, professional woofers for vented cabs. SME is correct...Huge spaces and outdoors present much different problems than smaller domestic sized spaces. Small spaces have a huge impact on the bass range. They often help "turbocharge" the output capabilities of the sub/s, which can help mask operational noises, but can also jack up the frequency response and decay characteristics. Outdoors it is MUCH easier to hear defects in the output of a sub that may be missed entirely in a room. This was part of the Skhorn design process was attempting to clean up as much of the typical operational noises and distortion as possible. It is intended to be used outdoor or 50,000 cu ft venues. In a home it's far more likely that the house and furnishings will be complaining well before a sub like that. This is why I prefer big horns, BP's or vented for high output, big space work. In my home I chose to use sealed subs (4 cabs with 8 drivers total). A single gigantic sub is often not ideal in a small room. I get that sometimes you just want a certain thing even though something else may work just as well. I'm guilty of it myself at times. The issue with horn subs is that they have to be big to get to 20Hz or lower. You can cheat a bit and undersize them but then they start to lose efficiency, headroom and the response gets jagged. Even worse is that it starts to cause issues with ringing. This is why most people don't have horn subs in their home. A well designed 20Hz horn is going to be big. This goes for a FLH , TH, what have you. For example the Othorn is pretty small for a high output TH that can really hit 25Hz. This is also the reason that there aren't nearly as many horn subs designed to go to 20Hz or lower. Usually when someone starts a thread like this my first questions are these, some of which you've answered. Budget? Listening habits: % music / % movies / how loud? How much space can you dedicate to the subwoofers? Current system / subs / room? What do you hope to improve about the sound of your current system?
  15. Ricci

    B&C 21DS115

    I had a chance to pull the specs from these after a bit of mild 20Hz break in. I have the 4ohm versions. This is about as close as I've seen to matching factory specs. This driver is encouraging so far. It's light and $100 cheaper than the 21SW152. The only thing I was disappointed with so far is they used a smaller diameter spider than on the Ipal and 152. It has a smaller coil diameter so the bigger 6" formers need a bigger spider but the large one would've improved suspension linearity most likely. I assume they did it for mechanical protection where the smaller spiders increased stiffness will keep things under control if hit with too much power. More later. Specs I pulled. Like I said this is really really close. They've got a pretty low DCR on this driver but it is so efficient that the impedance peak is huge so it'll likely be at or above 3 ohms min between 10-125Hz. Parameter Value Dim Fs 31.51 Hz Re 2.2 ohms[dc] Qt 0.2 - Qes 0.2 - Qms 6.86 - Mms 379.75 grams Rms 10.95386 kg/s Cms 0.000067 m/N Vas 266.34 liters Sd 1680.02 cm^2 Bl 28.52571 Tm ETA 3.94 % Lp(2.83V/1m) 103.67 dB Le 821.03 uH L2 1930.6 uH R2 57.1 ohms L3 0 uH R3 0 ohms 1kHz Le 2.62mH
  16. Ricci

    B&C 21DS115

    The WW cab is a good data point and just about the Goldilocks size for this driver for HT. Honestly I wouldn't go any bigger for this driver for a vented cab tuned near 18-20Hz. It just doesn't need it. 10-12ft seems about perfect. Any bigger would hit the point of diminishing returns. Don't forget that you'll likely get some lift below 30Hz in room. 3 to 6dB in the 16-20Hz range is a good general guess. 20ft would be great for 2 drivers though.
  17. Ricci

    Othorn - HT capable?

    The Othorn really operates best with the 21SW152-4, but the 21DS115-4 could work. In an apartment at those relatively low levels it could probably get down to 20Hz with a bit of EQ but it really is designed as a 25Hz and up sub. Even though the SB16 is a decent sealed sub that can technically go way lower than the Othorn it is not going to have greater headroom until below 20Hz. These are completely different sub designs with much different goals. The Othorn has so much more headroom I can't see how you would possibly use even 10% of it in an apartment. It should sound great operating at such a relaxed output level though. As an alternative you could do a Skhorn or a half of one, which can go lower than the Othorn depending on vent config and would be slightly smaller. Have you thought about doing a vented subwoofer with a 18 or 21" pro style driver that is bigger than the SB16 but not quite so big or heavy as the Othorn? It should still have plenty of extra headroom for your needs and be much higher efficiency to match your mains.
  18. Ricci

    Inductance modelling

    I've been following it. Not much time to post but I lurk over there a lot.
  19. Ricci

    Sundown ZV4 18D2 - sealed enclosure

    Put some PL premium or a bunch of wood glue in there and screw it through the wall. Should be fine.
  20. Ricci

    Ricci's Skhorn Subwoofer & Files

    I've got one of those and a 21ID for testing that they sent me by mistake. Was supposed to be 2 9601's. No measurements yet or for awhile probably. However I wouldn't hesitate to buy em and trust the factory specs. They have a good rep and VC mag has tested the 18" and a bunch of other 18S drivers. I expect that the 21SW152 might be just a bit "more" but a 21" like these for $400 is a killer deal. Should match up with the Skhorn and Othorn cabs well. Should be great vented too. EDIT: They dropped another $20 to 374...
  21. Ricci

    Ricci's Skhorn Subwoofer & Files

    Another deal...$394 18Sound 21NLW9601
  22. Ricci

    Ricci's Skhorn Subwoofer & Files

    Buy em now people!
  23. Both Kyle and myself have wanted to allow user submitted content for a long time. It's just a matter of how to go about it and separate it from " official" content. etc.
  24. It's not difficult. Just "make" a text which exhibits the desired delay for the overlay using excel or something. Save the files and import the measurements for the comparison. I've never had anyone really inquire about it so I never thought to post the ones I made.
  25. I gotta say Kyle the new site looks much better. The Klipsch example link really puts that in perspective.
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